Red Seal Plumbing Practice Exam

Which hot water boiler can be used to directly heat domestic water?

1. Cast iron sectional boiler

2. Fire tube boiler

3. Copper water tube boiler

4. Coil type boiler

The correct answer is: Copper water tube boiler

A cast iron sectional boiler may be used in a hot water heating system, but not directly to heat domestic water. The purpose of a cast iron boiler is to circulate hot water through a building's heating system. A fire tube boiler is also not suitable for directly heating domestic water. Fire tube boilers are typically used for steam heating systems. A coil type boiler is not recommended for directly heating domestic water as it is more suitable for space heating. The best option for directly heating domestic water is a copper water tube boiler. Copper is a highly conductive material that allows for efficient heat transfer and can handle high water pressure.